Browsing by Issue Date, starting with "2013-03-04"

Now showing 1 - 20 of 32247

Facile Growth of Thermochromic VO2 Nanostructures with Greatly Varied Phases and Morphologies
(2013-03-04)
Wang, Ying-Ting
;
Chen, Chun-Hua
;
材料科學與工程學系
;
Department of Materials Science and Engineering
We have successfully and reproducibly synthesized a variety of novel vanadium dioxide (VO2) nanostructures, including metastable monoclinic VO2(B) nanoneedles and nanocorals, orthorhombic VO2(O) nanoparticles, and monoclinic VO2(M) nanofacets by manipulating the aging time of a facile sol gel approach and the subsequent postannealing conditions. We envision that this previously unreported highly controlled synthesis and the resulting distinct morphologies of VO2 will not only provide a promising route for reliably selecting the phase, size, and morphology of these nanostructures, as well as achieving a fundamental understanding of their unusual temperature-dependent optical transmittance, but also facilitate the synthesis of functional VO2 nanostructures for a number of novel applications.
Synthesis of metal-free organic dyes containing tris(dodecyloxy)phenyl and dithienothiophenyl units and a study of their mesomorphic and photovoltaic properties
(2013-03-04)
Shellaiah, Muthaiah
;
Fang, Hsiao-Ping
;
Lin, Yu-Ling
;
Hsu, Ying-Chan
;
Lin, Jiann-T'suen
In this study we synthesized three metal-free organic dyes (Cpd11, Cpd16, and Cpd22) featuring 3,4,5-tris(dodecyloxy)phenyl and cyanoacrylic acid moieties as electron-donor and electron-acceptor/anchoring units, respectively, linked through various dithienothiophenyl conjugated spacers. Cpd16 exhibits mesomorphic properties, confirmed through polarizing optical microscopy, differential scanning calorimetly, and X-ray diffraction (XRD), due to the appropriate ratio of the lengths of its flexible chain to its rigid core. Molecular modeling of Cpd16, and its d-spacing determined from XRD data, verified the existence of a tilt angle in the SmC phase. Among these metal-free organic dyes, a dye-sensitized solar cell incorporating Cpd16 exhibited the best performance, presumably because of its better packing and its mesomorphic properties; the power conversion efficiency was 3.72% (V-oc=0.58 V; J(sc)=9.98 mA cm(-2); FF=0.65) under simulated AM 1.5 irradiation (100 mW cm(-2)). (c) 2013 Elsevier Ltd. All rights reserved.
Audio-separating apparatus and operation method thereof
(2013-03-05)
Lee Yi-Hsuan
;
Choi Charles Tak-Ming
This present invention discloses an audio-separating apparatus and operation method thereof. The audio-separating apparatus applies both blind source separation and noise reduction mechanisms. The audio-separating apparatus only uses one microphone to record mixed sound signals. After applying the noise reduction mechanism, noise reduced signals and the mixed sound signals are used as the inputs of the blind source separation. The method may avoid the spatial aliasing effect caused by using a microphone array to record the mixed sound signals. Besides, speech segment losses caused by processing the noise reduction will be effectively recovered, which may help the hearing impaired recognize target speech signals.
Method for measuring optoelectronic memory device
(2013-03-05)
Wei Kung-Hwa
;
Sheu Jeng-Tzong
;
Chen Chen-Chia
;
Chiu Mao-Yuan
A method for measuring an optoelectronic memory device, includes: grounding a source electrode of the optoelectronic memory device; applying a drain electrode voltage to a drain electrode of the optoelectronic memory device and measuring a first current at the drain electrode; using an optical source to illuminate the optoelectronic memory device and measure a first and a second current at the drain electrode; and comparing the sizes of the first current and the second current so as to judge the functional parameters of the optoelectronic memory device.
Coffee-ring effects in laser desorption/ionization mass spectrometry
(2013-03-05)
Hu, Jie-Bi
;
Chen, Yu-Chie
;
Urban, Pawel L.
;
應用化學系
;
Department of Applied Chemistry
This report focuses on the heterogeneous distribution of small molecules (e.g. metabolites) within dry deposits of suspensions and solutions of inorganic and organic compounds with implications for chemical analysis of small molecules by laser desorption/ionization (LDI) mass spectrometry (MS). Taking advantage of the imaging capabilities of a modern mass spectrometer, we have investigated the occurrence of "coffee rings" in matrix-assisted laser desorption/ionization (MALDI) and surface-assisted laser desorption/ionization (SALDI) sample spots. It is seen that the "coffee-ring effect" in MALDI/SALDI samples can be both beneficial and disadvantageous. For example, formation of the coffee rings gives rise to heterogeneous distribution of analytes and matrices, thus compromising analytical performance and reproducibility of the mass spectrometric analysis. On the other hand, the coffee-ring effect can also be advantageous because it enables partial separation of analytes from some of the interfering molecules present in the sample. We report a "hidden coffee-ring effect" where under certain conditions the sample/matrix deposit appears relatively homogeneous when inspected by optical microscopy. Even in such cases, hidden coffee rings can still be found by implementing the MALDI-MS imaging technique. We have also found that to some extent, the coffee-ring effect can be suppressed during SALDI sample preparation. (C) 2013 Elsevier B.V. All rights reserved.
Display
(2013-03-05)
Fan Shih-Kang
;
Chiu Cheng-Pu
;
Mo Chi-Neng
;
Chiang Mei-Tsao
A display including a first substrate, a first electrode, a second substrate, a second electrode, and a mixed solution is provided. The first electrode is disposed on the first substrate, and the second electrode is disposed on the second substrate. In addition, the mixed solution is disposed between the first electrode and the second electrode. Moreover, the mixed solution includes a solution and a plurality of first neutral micro-particles disposed in the solution.
交大e-News第136期
(2013-03-05)
Secretariat
;
國立交通大學秘書室
Temperature effect on the photo-epoxidation of propylene over V-Ti/MCM-41 photocatalyst
(2013-03-05)
Nguyen, Van-Huy
;
Wu, Jeffrey C. S.
;
Bai, Hsunling
;
環境工程研究所
;
Institute of Environmental Engineering
The effect of reaction temperature on the gas-phase photocatalytic epoxidation of propylene was systematically studied over V-Ti/MCM-41 photocatalyst at different temperatures (298-393 K). Temperature significantly influences the product distribution of photo-epoxidation. Raising temperature is favorable towards the formation of propionaldehyde (PA) due to inhibition of PA transformation to propionic acid (C2H5COOH), the intermediate product of acetaldehyde (AA). Results indicated that the reaction temperature has a dual-action to the reaction rate: (1) improving the desorption of reaction products, which provides more active sites for reaction and (2) reducing the adsorption of propylene on the photocatalyst, which declines the reaction efficiency. (C) 2012 Elsevier B.V. All rights reserved.
Structural characterizations of Cu3Pt electrocatalyst featuring Pt-rich surface layers synthesized via mechanical alloying and selective dissolution routes
(2013-03-05)
Hsieh, Yi-Fan
;
Hsieh, Yu-Chi
;
Tseng, Yuan-Chieh
;
Wu, Pu-Wei
;
Chao, Cheun Guang
We demonstrate a selective electrochemical dissolution route to prepare Cu3Pt catalysts featuring Pt-rich surface layers (Cu3Pt-Pt rich surface) from mechanically alloyed Cu3Pt. These catalysts were investigated by X-ray diffraction and X-ray absorption spectroscopy, and were subjected to electrochemical analyses to evaluate their catalytic properties. With appropriate anodization, Cu3Pt entered an oxygen-evolving regime where the corrosive dissolution of Cu dominated the reaction. Selective dissolution was carried out to prepare Pt-rich layers at the surface, while Cu3Pt was left unreacted at the core. An increase in the anodization duration modified the sample morphology, with the redistribution of Pt atoms to thicken the surface layers. A charge transfer from Pt to Cu accompanied the structural transition from Cu3Pt to Cu3Pt-Pt rich surface upon selective dissolution, rendering the sample to be electronically similar to a metal Pt. However, compared to the metal Pt and conventional Pt-based catalysts, the proposed structure is a more economical catalyst for direct methanol fuel cell, with less need of Pt in raw material but increased electrochemical surface area by exposing enormous Pt at the surface with an increase in the anodization duration. (C) 2012 Elsevier B.V. All rights reserved.
解讀柏拉圖《理想國》中的三個故事
(2013-03-06)
苑舉正
;
開放教育推動中心
;
Open Education Office
課程首頁本課程是由交通大學新文藝復興閱讀計畫提供。 96 年 8 月當各大學紛紛摩拳擦掌準備迎接新生的同時，交通大學校長吳重雨則因為一則來自於七月份泰晤士報，有關於英國首相布朗公布其夏日讀書清單的新聞中，看到了他對知識的尊重。在這同時，吳重雨校長也思考著，要如何為學生準備追求知識的環境和激發他們對知識的尊重與喜愛。台積電張忠謀董事長曾陳述他 18 歲進入哈佛那一年，博覽文史哲理工經典群籍，至此奠定了他求知的基礎，並借海明威名言，將其改為「哈佛這一年為人生可帶走的盛宴。」吳重雨校長以張董事長的學習為借鏡，認為學生固然能藉由自我閱讀的方式學習到豐沛的知識，但透過名人、大師親臨現場地介紹經典書籍，更能加深學子們對於書籍的認識與興趣，這也是「新文藝復興閱讀計劃」 ( 以下簡稱 : 「經典名著選讀」 ) 活動展開籌劃的緣由。於是，吳重雨校長便積極敦請「交大通識教育委員會」，接手籌備本計劃的相關活動，而該中心也成為實際施行本計畫的策動、開課以及認證單位。至此，期許交大學子藉由閱讀、聽講來提昇人文素養、開拓視野的「新文藝復興閱讀計劃」，就此展開。
Effects of Hydrogen Bonding on Internal Conversion of GFP-like Chromophores. II. The meta-Amino Systems
(2013-03-07)
Cheng, Chi-Wen
;
Huang, Guan-Jhih
;
Hsu, Hung-Yu
;
Prabhakar, Ch.
;
Lee, Yuan-Pern
To rationalize the efficient quenching of the fluorescence and the Z -> E photoisomerization of m-ABDI, the meta-amino analogue of the green fluorescent protein (GFP) chromophore, in protic solvents, the femtosecond time-resolved fluorescence and transient infrared (TRIR) spectra of m-ABDI in CD3CN, CH3OH, and CD3OD are determined. For solutions in CD3CN, the fluorescence decay lifetime is similar to 7.9 ns and IR absorption lines near 1513, 1531, 1557, and 1613 cm(-1) of m-ABDI in its electronically excited state were observed with a decay time >5 ns. For solutions in CH3OH, the fluorescence decay is double exponential with time constants of similar to 16 and 62 ps. In addition to IR absorption lines of m-ABDI in its electronically excited state with a decay time of similar to 16 ps, new features near 1513, 1532, 1554, and 1592 cm(-1) were observed to have a rise time of similar to 19 ps and a decay constant of similar to 58 ps, indicating formation of an intermediate. The assignments for the IR spectra of the ground and excited states were assisted with DFT and TDDFT calculations, respectively. We conclude that the torsion of the exocyclic C=C bond (the tau torsion) is responsible for the nonradiative decay of electronically excited m-ABDI in CD3CN. However, in CH3OH and CD3OD, the solute-solvent hydrogen bonding (SSHB) interactions diminish significantly the barrier of the tau torsion and induce a new pathway that competes successfully with the tau torsion, consistent with the efficient fluorescence quenching and the diminished yield for Z -> E photoisomerization. The new pathway is likely associated with excited state proton transfer (ESPT) from the solvent to m-ABDI, particularly the carbonyl group, and generates an intermediate (ESPT*) that is weakly fluorescent.
Effects of Hydrogen Bonding on Internal Conversion of GFP-like Chromophores. I. The para-Amino Systems
(2013-03-07)
Huang, Guan-Jhih
;
Cheng, Chi-Wen
;
Hsu, Hung-Yu
;
Prabhakar, Ch.
;
Lee, Yuan-Pern
To understand the effects of solvent-solute hydrogen bonding (SSHB) on the excited-state dynamics of two GFP-like chromophores, p-ABDI and p-CFABDI, we have determined the quantum yields for fluorescence (Phi(f)) and the isomerization Z -> E (Phi(ZE)) and the femtosecond fluorescence and transient infrared absorption in selected solvents. The behavior that Phi(ZE) congruent to 45 0.50 in aprotic solvents, such as CH3CN, indicates that the E-Z photoisomerization adopts a one-bond-flip mechanism through the torsion of the exocyclic C=C bond (the tau torsion) to form a perpendicular species (tau similar to 90 degrees) in the singlet excited state followed by internal conversion (IC) to the ground state and partition to form the E and Z isomers with equal probabilities. The observed Phi(ZE) decreased from 0.50 to 0.15-0.28 when CH3CN was replaced with the protic solvents CH3OH and CF3CH2OH. In conjunction with the solvent-independent rapid (<1 ps) kinetics for the fluorescence decay and the solvent-dependent slow (7-20 ps) kinetics for the ground-state recovery, we conclude that the SSHB modifies the potential energy surface for the tau torsion in a way that the IC occurs also for the twisted intermediates with a tau-torsion angle smaller than 90 degrees, which favors the formation of the Z isomers. The possibility of IC induced by torsion of the exocyclic C-C bond (the phi torsion) is also considered but excluded.
MICROALGAE CULTIVATION MODULE
(2013-03-07)
Lin Chih-Sheng
;
Chiu Sheng-Yi
;
Kao Chien-Ya
A microalgae cultivation module for carbon reduction and biomass production is provided, which includes a first photobioreactor set, a second photobioreactor set, a gas switching device and a control unit. The gas switching device is communicated to the first and the second photobioreactor sets. The control unit is coupled to and controls the gas switching device, thereby aerating a waste gas into the first photobioreactor set and aerating air into the second photobioreactor set for a first predetermined time, then aerating the waste gas into the second photobioreactor set and aerating the air into the first photobioreactor set for a second predetermined time. The first and the second photobioreactor sets include a microalgae species.
WASTEWATER TREATMENT METHOD USING ANNULARLY ARRANGED MICROORGANISM CARRIERS
(2013-03-07)
LEE Der-Ming
;
Chiang Ming-Kuei
;
Chen Chin-Te
;
Sung Keng-Chuan
;
Lin Jih-Gaw
A wastewater treatment method using annularly arranged microorganism carriers in a reaction tank, which defines therein an upper reaction area, a lower reaction area and a passage area surrounded by the microorganism carriers and kept in communication between the upper reaction area and the lower reaction area. Microorganisms including nitrifying bacteria and autotrophic denitrifying bacteria are attached to the surface of each microorganisms carriers and suspending in the water of the reaction tank for causing Anammox reaction to convert NH4+ and NO2− in wastewater into nitrogen gas, achieving removal of total nitrogen compounds from water. The microorganism carriers are used to retain microorganisms in the reaction tank, enhancing the treatment efficiency.
搖滾樂團知多少
(2013-03-10)
王泓文
;
Department of Communication and Technology
;
傳播與科技學系
介紹搖滾樂團史，以及一個基本的搖滾樂團人員配置，各位置使用的樂器，還有歷史上有名的國內外搖滾樂手。
戲劇藝文活動之城鄉差距
(2013-03-10)
鄭豪
;
Department of Communication and Technology
;
傳播與科技學系
文化部將所有藝文活動展演劃分為十三種項目，而戲劇類就是其中之一，利用此圖表可看出台灣之戲劇類藝文活動數量的不足與城鄉差距。
SOHO族　舒服過生活
(2013-03-10)
林妍君
;
Department of Communication and Technology
;
傳播與科技學系
有這樣一種工作型態，讓人們不用朝九晚五到公司打卡，不用日復一日駛過上班必經的塞車路段。工作的時間由自己決定，而工作內容更可以自由挑選，每個人都能藉此當自己的老闆，他們不是任何人的員工。
世界真的和平嗎
(2013-03-10)
張睿文
;
Department of Communication and Technology
;
傳播與科技學系
第二次世界大戰之後，大範圍或全面性的戰爭隨之結束，世界進入了相對和平的年代。可是戰爭並未結束，在局部或地方的紛爭仍未止息。
減少垃圾　愛護地球
(2013-03-10)
朱寶欣
;
Department of Communication and Technology
;
傳播與科技學系
環保已經是世界性的議題，雖然人們都知道要愛護地球，但是很多觀念停留在表面，缺少有效的實行方法。《亞洲環保先鋒》展示了新穎的環保技術，為環保作出更大的貢獻。
老屋重生　文化復興
(2013-03-10)
李佩玹
;
Department of Communication and Technology
;
傳播與科技學系
台南府城，道路熱鬧熙攘，孔廟、全台首學、安平古堡、赤崁樓……歷史古蹟座落於棋盤巷弄間，等待陌生的跫音踏階來訪。街道中許多的傳統古宅、老屋，結合文化、設計而改頭換面，重新置換成各式各樣的創意基地，吸引台灣各地的旅客欣賞、體驗，成為台南在古蹟與美食之外新興的觀光特色。